AT&T MERLIN LEGEND System Reference Manual page 334

Features
Queued Call Console
Description
QCC Operation
The queued call console (QCC) is an answering position available only in the
Hybrid/PBX mode. The QCC is used by system operators to:
Answer outside calls that are directed to a system operator position.
Answer inside calls.
Extend inside and outside calls to an extension or an outside telephone
number.
Serve as a message center.
Make outside calls—for example, for users with telephones restricted from
making outside calls.
Set up conference calls.
Monitor system operation.
Outside calls programmed to ring at a QCC are sent by the system to a
common QCC queue where they wait to be sent to a QCC system operator
console. When a QCC system operator is available to receive a call, the system
removes the call from the queue and sends it to an idle Call button on the QCC.
Calls are delivered to the system operator on a "first in, first out" basis according
to the call priority level assigned to each type of call. If more than one system
operator is available, the system operator who has been idle the longest
receives the call.
A system operator is considered available to receive calls from the queue when
there are no active calls at the console, or when an active call is put on hold or
released from the console. A system operator is considered unavailable to
receive a call from the queue under the following conditions:
A call is ringing on the console.
The system operator is on a call.
The system operator has a call in the split condition.
The system operator is setting up a conference.
All Call buttons are busy.
The console is being used for system programming.
The console is in the maintenance mode.
The system operator is in the process of programming a Personal Directory
listing or the Alarm Clock.
The console is not plugged in.
Queued Call Console 2-285